A squirrel monkey looks into the camera during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)

London Zoo annual weigh in

The height and mass of every animal in the zoo, of which there are over 16,000, is recorded and submitted to the Zoological Information Management System. This is combined with animal measurement data collected from over 800 zoos and aquariums in almost 80 countries, from which zoologists can compare information on thousands of endangered species. (Getty)

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